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ceph: handle -ESTALE reply

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Send requests that operate on path to directory's auth MDS if
mode == USE_AUTH_MDS. Always retry using the auth MDS if got
-ESTALE reply from non-auth MDS. Also clean up the code that
handles auth MDS change.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2013-11-22 14:21:44 +08:00
parent 979abfdd5c
commit ca18bede04
1 changed files with 11 additions and 20 deletions
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31
fs/ceph/mds_client.c
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@ -713,14 +713,15 @@ static int __choose_mds(struct ceph_mds_client *mdsc,
struct dentry *dn = get_nonsnap_parent(parent);
inode = dn->d_inode;
dout("__choose_mds using nonsnap parent %p\n", inode);
} else if (req->r_dentry->d_inode) {
} else {
/* dentry target */
inode = req->r_dentry->d_inode;
} else {
/* dir + name */
inode = dir;
hash = ceph_dentry_hash(dir, req->r_dentry);
is_hash = true;
if (!inode || mode == USE_AUTH_MDS) {
/* dir + name */
inode = dir;
hash = ceph_dentry_hash(dir, req->r_dentry);
is_hash = true;
}
}
}
@ -2161,26 +2162,16 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
*/
if (result == -ESTALE) {
dout("got ESTALE on request %llu", req->r_tid);
if (!req->r_inode) {
/* do nothing; not an authority problem */
} else if (req->r_direct_mode != USE_AUTH_MDS) {
if (req->r_direct_mode != USE_AUTH_MDS) {
dout("not using auth, setting for that now");
req->r_direct_mode = USE_AUTH_MDS;
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
} else {
struct ceph_inode_info *ci = ceph_inode(req->r_inode);
struct ceph_cap *cap = NULL;
if (req->r_session)
cap = ceph_get_cap_for_mds(ci,
req->r_session->s_mds);
dout("already using auth");
if ((!cap || cap != ci->i_auth_cap) ||
(cap->mseq != req->r_sent_on_mseq)) {
dout("but cap changed, so resending");
int mds = __choose_mds(mdsc, req);
if (mds >= 0 && mds != req->r_session->s_mds) {
dout("but auth changed, so resending");
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;